Carburetor-float-valve mechanism



Sept. 7 1926. y 1,598,948Y

F. J. WATT GARBURETOR FLOAT VALVE MECHANISM Filed Jan. 20. 1923 Sme/nto@ spect to the ioat to change its angle of thrust Patented` Sept. 192376.

FRANK J.

l Lasers i.

l, PATENT orifice.V

WATT, OF DETROIT, MICHIGAN, ASSIGNOR TO GENERAL MOTORS CORPORA- :i

TION, OF DETROIT, MICHIGAN, A CORPORATION OE DELAWARE.

. cARBURnToR-FLoAnvALi/n ME-cHANrsM.

Application filed January ze, 1923.- seriai No. 613,952.

This invention relates to ioat valve mechanism, and is illustrated as embodied in the carburetor of an automobile.

Devices such as automobile carburetors are subjected to vibration and to violent shocks,

tending to upset the action of the Hoa-t valve at the same time more rapidly and completely to openthe valve when far enough from its seat so that such control is not needed, so that the level of the fluid in the.

iioat chamber may be maintained within narrower limits than has-'heretofore been `considered feasible. `,With this yobject in view, the invention' contemplates controlling the valve from the float by connections operating with progressively greater power,and progressively moreslowly, as the valve approaches its seat, as` for example by using a Vconnectirig link which is shiftable with reas the float rises. Y 1

In the illustrated embodiment of theV invention, the valve is flexibly clipped to a pivotedV arm by a novelspring retainer, and the linkconnectingthis arm with the kfloat is arranged to form with the hinged part of the iioat a toggle which approaches its straightened position as the valve approaches its seat, thus operating the valve rapidly except when adjacent its seat, at which time the powerful toggle action is utilized to con- `trol it. e

The above and otherzobjects'and `features ofthe invention, including an arrangement for adjusting the connectinglink and other y novel combinations and improved constructions of parts, will be apparent from the fol-k lowing description of the `particular illus- .tra-tive' embodiment of they invention shown inthe accompanying drawings, in which:

yFigure 1 is a view` partly in section and If these 4are permitted to;

partly in elevation, showing the float valve mechanism assembled in a carburetor;

Figure 2 is a view corresponding to part or" Figure 2, but with the parts in diiterent positions; i

Figure 3 is a bottom plan view `of the float and theconnections from the float to the valve; Y

Figure 4 is a section generally on the line 4 4 of'Figure 3; and y Y Figure 5 is a perspective view of the novel valve retainer. l f In the arrangement-,shown in Figure 1, the loatchamber 10 is secured to a carburetor casing 12, with the fuel nozzle 14 and air inlet 16 arranged centrally thereof, and `with a passage 18 for the admission of iiuid to the float chamber. A float 2O `is provided to control the -level of fluid in the float chamber by openingV and closing a needle valve 22, having a seat formed in the bottom of a bushing 24 which serves as a guide for the skirt 26 of the valve. The valve is provided with a Vsteni28 having a rounded end 30 forming a head and a restricted neck adjacent thereto. The valve is supported by engagement of rounded end 30 with the cross portion of a U-shaped arm 32, pivoted on a pin 34 carried by a bracket 36 held by a tap Screw 38, the valve being flexibly connected to the arm by a novel spring retainerjor clip 4() having anopenng42 for the passage of head 30 and an adjacent notch 44 to engage the restricted neck of the valve stem.

The loatis pivoted to bracket 36 by a hinge member, having two pairs of arms 46 attached to the float by screws 48 and connected by a cross portion 50, and a pair of arms 52 mounted `on pin 54, which is carried by bracket 36 and which is parallel to pin 34. This hinge member carries a pin 56, parallel to pins 34 and 54, and on which is pivotally mounted a U-shaped link 58 pivotedat its opposite ends to arm 32 by a cross pin 59, and which is arranged to change its angle of thrust as the valve approaches its seat. l

.It will be observed that link 58 and arms 52 practically constitute a toggle, which operates Varm 32 rapidly when the valve is open (Fig. 2), andk which approaches its straightened position as the valve approaches its seat (Fig. 1), thus closing the valve progressively more slowly'and with "progres- 'reater power and controlling it 'efjgardless of shocks and vibrae is of sheet metal, Wl ich nge the relative positions i l aan thus adjust the exntto Whieh the toggle approaches its rllie flexible Connece embodiment oitl mv L l wm-'l i] 'i 104m? 'L I" aus ieen @estimen m (mau. u is limit its scope thereby7 the terms o' the apvtheir relative positions.

z, Float valve mechanism comprising, in Combination, a hendahle bracket haring' tu'o parallel ulerum pins, a float hinoe l iounted on one pin, a valve-operating' aim mountedL on the other pin, and a tog'gie link connecting-. the hinge and the arm.

3. Float Valve mechanism eomlirising, in combination, a. lloat7 a Valve, a valifeoperatingY arm Connected to the float, and a. re tainer flexibly connecting the valve to the arm.

4. Float Valve mechanism eomgrising' in combinationr` a lioat Valve having a rounded outer end and a restricted neck. aV sup port-ing arm on Which the rounded end rests, and a spring'retainer engaging` the neck and flexibly connecting the valve and :he chai'ilier, and having, in Combination therevfuiif-s, hinge arm for the float and a milve-ogerating' arm moving` about parallel axes, and a link eonneetin the loat hinge a d the valve-operating .i in such a inanner as to turn with respect to the iloat to change its angle oi thrust as the float rises.

T. A carburetor Comprising a Jfuel chamber, a luol inlet valve there `r, a float in said chamber toggle n'ieehanism Connected to the float Yfor aeazuating said ralve in response *i inoz'einente oiLl said float, and means for adjusting the position ot said toggle meehan'im in the fuel chamber including` an adjustable pivot support for one o'f the arms ol the toggle.

ea huretor comprising a 'fuel Chaminlet valve the fior, a tloat in linker, )ivoted arm supporting Yoat, a pivoted ralre actuatingA arm f connected to Athe valve and means ng the doat supporting' arm on the le the pivot tou'art the float to the valve v arm and adapted to operate 'the valve more slowly and with greater power as the valve ap] oaohes its seat.

9. Structure as in claim 8, the connecting leans comprising a link between the tioat arm and the valve actuatingP arm and `forining with Jdie former a toggle.

in testimony whereof l my signa-- ture.

FRANK J. llvi'w. 

